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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39bb27e5b3d3ef871f67881f280122f93426b7d3f18f1f1194c72677f8964a55' 
  AND token = 'ESwoGJFUsLPZtSvNtyl1+OI7in3cbuCx3FefOA6a/SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}